Thanks everyone ... yep, the SHO version was different! I've continued the fun of having SHOLRGB data and produced a foraxx version that is, well, it just is ... different too
I've taken Alex's advice and blended/mangled the 'plain' SHO, foraxx SHO and LRGB versions (in PI, not PS - sorry mate) just because it is indeedee el geeko funness. I'm still tweaking that blended image but will share tonight for a giggle.
Dave - I do use the photometric colour calibration early in my workflow which goes something like: SCNR->A/DBE->image solver->SPCC->(SCNR again, maybe)->noiseX->blurX->starX->stretching/histograms, colours, saturation, intensities, blending etc. I'm still learning about the many (many) PI tools and squillions of ways of doing things ... it'll be a loooong multi-year journey. For example, the multi-level tools (HDR etc) are interesting and I'm trying (unsuccessfully atm) to use them too. Also, I'm now processing stars separately to the main target for all images and using a mix of arcsinh and histogram stretching to draw out star colours provided by SPCC without making them look too gawdy.
John - I'm not yet brave enough to do anything other than what the tutorials say. A kinda 'stay on the roads, keep clear of the moores' thing
Cheers everyone, Alex.